Thanks Bob...initially I was going on this was a NAV antenna and there were no issues until the wing tip was installed.... there was no PTT or transmitting involved like the other thread.

When I say it should not matter if it was COM antenna, it shouldn't especially if not transmitting (which was not mentioned).. However you are right RF leaking in the cabin and/or poor grounds/shielding might cause issues with flight instruments or autopilot.

My statement is based on nearly twenty years of reports by RVers who have installed the Archer COM antenna in RV wingtips. The issue isn't the RF properties of the antenna rather the consequences of a primarily horizontal orientation in the RV wingtip.

(My observation is based on installations in two-place RVs.....perhaps the RV-10 wingtip is a different scenario?)

COM antennae are designed for vertical polarization and the RV wingtip doesn't accommodate the Archer in a vertical orientation. This results in performance that is less than a properly installed 'whip' COM antenna. There have also been reports of significant 'shadowing' (not sure if that is a technical term) supposedly from the proximity of the antenna to the metal wing. The Archer COM antenna installed in a composite aircraft that allows vertical orientation would most likely be a good performer.

The Archer NAV antenna in my RV-6 wingtip works very nicely because NAV is designed for horizontal polarization which the RV wing tip accommodates well. There is some shadowing at the fringes of coverage range but overall it works well in my RV. But for me it's a moot point since I don't fly IFR and no longer use VOR navigation. :)

I have made the Archer antenna for most of my RV builds. In my experience, they perform acceptably as a NAV antenna when navigating with VORs. Where they shine IMHO is as a LOC/GS antenna. Rock solid. I am sure that has something to do with being close to the station and the airplane pointing directly at the transmitter. If that's all you use it for, it can't be beat.

One of my homemade versions is installed into our East Coast RV-14A, N914VA. Worked great while I had the airplane. Might ask our rep, Zack for his experience.

I believe this is precisely what is happening. Sorry for not mentionning it before but my problem is with a right side com antenna and yes it only happens when PTT is engaged. The install has changed since these pictures were taken as the inboard part of the antenna is now installed on the top part of the wingtip.

https://photos.app.goo.gl/TaoYR2oZ7ALdenzp7

I cannot see the photos.

I believe the -10 (and -14) wings are thicker than other RVs, allowing more vertical throw. They also are wide enough fore-aft to allow you to mount the leading edge of the antenna radiator at that thickest point of the wing - NOT full forward - again, giving you as much vertical polarization as possible. As I said, it is not as good as an external antenna but for my use - ATIS and backup - it works for me.

I can't see the photos either. Might be a permissions problem?

See:
https://photos.app.goo.gl/TaoYR2oZ7ALdenzp7

See this note from the instructions:

"It has recently been brought to my attention that some folks have experienced problems with RF interference with the late model panel devices. These new devices operate on lower voltages and when the RF energy gets on the bus wires it can travel back to the panel area and cause all kinds of problems. SO, It is recommended that the cable used for the transmitted signals be the double shielded type and the cables should be run as far from Bus wires as possible.
The double shielded types are; RG55, RG142,RG213 and RG400.
These are commonly available types but there are others."

B

On the photos it is clear you have NAV/Strobe wire running along the antenna arm. Don?t do that.

Carl